Doppler-tuned Bragg Spectroscopy of Excited Levels in He-Like Uranium: a discussion of the uncertainty contributions

TL;DR

This paper discusses the uncertainty analysis of a high-precision measurement of the energy of an excited state transition in He-like uranium using Bragg spectroscopy at a storage ring, comparing different calibration references.

Contribution

It provides a detailed uncertainty analysis for the first time in the context of measuring He-like uranium transition energies with a Johann-type Bragg spectrometer.

Findings

Comparison of stationary and moving x-ray source references.

Quantification of experimental uncertainties in energy measurements.

Enhanced understanding of calibration accuracy in high-energy spectroscopy.

Abstract

We present the uncertainty discussion of a recent experiment performed at the GSI storage ring ESR for the accurate energy measurement of the He-like uranium 1s2p3P2- 1s2s3S1 intra-shell transition. For this propose we used a Johann-type Bragg spectrometer that enables to obtain a relative energy measurement between the He-like uranium transition, about 4.51 keV, and a calibration x-ray source. As reference, we used the Ka fluorescence lines of zinc and the Li-like uranium 1s22p2P3/2 - 1 s22s 2S1/2 intra-shell transition from fast ions stored in the ESR. A comparison of the two different references, i.e., stationary and moving x-ray source, and a discussion of the experimental uncertainties is presented.